Selecting apparatus for telephone systems.



Patented May 13, 1913.

6 BHEETE-SEEET l.

Saw@ Q. Q Nw. .L Y o @W6 v @Q R. 0. M.HAsT1NGs. i SELEGTING APPARATUS FOR TELEPHONE SYSTEMS.

APPLICATION FILED APR.22,1812.

.mw mm wmm M @S wm lw.

Patented May 13, 1913.

R. C. M. HASTINGS.

SBLEGTING APPARATUS FOR TELEPHONE SYSTEMS.

APPLICATION tlLn APR. 22, w12

5 Inventor Attorneys R. C. M. HASTINGS.

SELBCTING APPARATUS You TELEPHONE SYSTEMS.

@ed my 13, 1912.

V SHEE1`S-HEET Paten APPLUATION FILED APLZ'). 1912A .RIE mill lulllll 'g5 Witnessesf R. C. M. HASTINGS.

SELBGTING APPARATUS POR TELEPHONE SYSTEMS.

APPLIUATION FILED APR. 22, 1912.

5 SHEBTS-SHBET 4,

Patented May 13, 1913 Attorneys lnventr' R. G. M. HASTINGS. SELECTING APPARATUS POR TELEPHONE SYSTEMS.

APPLIUATION FILED APILZZ, 1912.

Patented May 13, 1913.

5 SHEETS-BHEET v5.

Inventor Attorneys inarr sfrrns enana orme;

RUBEN C. M. HASTINGS, OF COLUMBUS, OHI, ASSIGNOR TO THE INTERNATIONAL TELEPHONE CO., OIf COLUMBUS, OHIO. .y

SELECTING APARATUS FOR TELEPHONE SYSTEMS.

Specification ot' Letters Patent.

Patented .May i3, 1913.

Application filed April 22, 1919. Serial No. 692,465.

o all fui/Lola it may concern Be it known that l. 'Komix rinus, a citizen et the United States, residing at Columbus, in the county of Franklin and State ot Ohio1 ha te invented a new and useful Selecting?l iipparatus for" Telephone Systems, ot which the following' is a specitication.

rlhe present invention relates to an iinproved selecting apparatus t0 be mounted in the central or exchange' of a` telephone system` whereby the, operator may select and signal a .single or selected called subscriber and simultaneously shunt all other sub scribers. This particular instrument is designed 'tor use in eonnectioil'.with the tem oit selective telephony, as set iorth in a r-o-Apemflingl application tiled August 25), 1911, Serial No. till-6,097, wherein a loop circuitis shown havingr a plurality ot subscribers sets connected in series, and provided with a peculiar form ott shunting device. set. forth in an application tiled ot'even date herewith, Serial No. 692,467, which by the manipulation ott' the present selecting appa- 'atus is operated to shunt those instrun'ients not called7 and yet cause a signal to be made to indicate that the line/is busy. V

` In th-e present instance, a frame is pro vided, harina mounted therein a shaft capable ot' being rotated in both directions.'

one having no effect upon the indicator' and the selecting carriage and the other rotation rotating an indicator to indicate which subscribers set will be placed on the line, and at the same time rotate the carriage to bringl into play when the shat't pushed upon the proper stops and other mechanisms to place the desired subscriber on the line7 shunting all the others except the call-l ing and called subscriber', and automatically rinzg'inp,` the call bell at the called Subseriber"s set7 the carriage beingrctained in this position and during the conversation, at which time the removal of the jack by the.exchange operator will ialtomatically release the carriage ot'y tbe selecting key andpermit its movement to its initial position. and the un-shunting of all ot' the subscribers sets, thus placing them all in rnon 'interfering position, and so that the -exchange may be called by'any one of the other subscribers for inter-communieation;

W ith the foregoing and other objects in View which ywill appear as the-description C. M. llasywhich mesi proceeds, the invention resides in the eombination and arrangement ot' parts and in thc details o't eonstriu'ti'on hereinafter de-4 scribed and claimed, it being understood that changes in the precise embodiment ot the invention herein disclosed can be made without departing trom the spirit ot the invention.

ln the drawinefs: Figure 1 is a side elevration ot' the select-ini;` key and automat-ic signal operating device, taken 'from the rig,;ht-hand side thereof, with the carriage in its initial position. Fig'. a similar view with the parts in the position they as- .sume utter haring sleleeted a predetermined subscriber and signaled. l `ig. 3 is a lett hand side elevation ot the apparatus. Fig. l is a longitudinal sectional View ot the apparatus. fliig. l is a cross section taltcn on line 5-5 egt Fig. l. Fig. C is a cross sect-ion taken on line (3--6 ot Fig. l. y Fig. 7 is a longitudinal section taken on line `T-7 of fligjl. litige. S, 9, and l1. are detail views oit parts detarhed. Fig. l() is a diagrammatic view ot a loop circuit telephone system with the seh-fetlng key in diagram in use therein. I

AThe selecting key, which is particularly set Forth in detail in Figs. l to t), and in dagram in Fig. 10, and which is mounted i'or operation at the exchange or central of the system, comprises an open trame 2, the tour cylimlrical guide and supporting rods 3, 4, 5 and o, respectively, upon which are mounted the respective parts ot the key. Mounted l'or a reciprocatory sliding movement upon the main rod 3, is the carriage 7, havim;V the central tubular portion 8, which formsv the mounlingwfor the carriage upon the rod Si. A coiled spring is mounted upon said rod 2l, and exerts u tension to normally .hohl the earl-laire toward ,initial position or as viewed in Fie'. toward the lett. Depending below and parallel to the portion 8, is a plate t), provided with ratchet teeth 1t), at all times with tl i actuating toothed wheel ll. said wheel being' rotatably mounted upon the shalt 1Q, jouri'ialed transversely of the trame, between the two plates 13 and ill-l, which 'form in reality a casina. Projecting upwardly from and at each end ot the tube tl, are. two arms l5, which are provided with eyed terminals 16, which slidably lit upon the rod 1, and have disposed therebetween and upon the rotatable een rod 4, the selecting` cylinder or drum 1.7,

whose ley 17", fits within the keyway 4 or the rod or shail't 4, so that the said cylinder may slide upon rodl, and yet be caused. to rotate therewith, the purpose of which will presently appear.

By carefully examining the selecting cylinder or .drum 17, it will he noted that the forward portion of thepcriphery thereof is provided with a series of longitudinal grooves 1S, spaced apart at equi-distanoes the full circumferences of the cylinder, each groove representing one subscribers setl in the system, there therefore being, when twelve sets are on the line,l twelve grooves 18. The outer end of the shatter rod '4, as at 19, carries an indicating arm or pointer 20, to indicate by pointingto the numbers on a dial (not` shown) upon the tace of the lrey, the subscribers set that will be placed in communication by the proper manipulation of the key. rThe outer ends of the grooves 16 terminate in the circumferential groove 22, which when the selecting' cylinder is in initial position, as in Fig: 2, will have the lockingl pin or screw 23, mounted in the itrame above the cylinder, itting; therew in,'to prevent the movement of the cylinder accidentally and yet permit lthe cylinder to he pushed inwardly connectingl position as shown ir 3, 'through the rotation ot the operating rod 24. yllhe rod is profu vided with a hey-way 25, which permitsthe said push rod to ce rotated reely'to the right, but when turned to the left'throws in the pawl and ratchet device 26, so that the sleeve 27 mounted in the casingl28, and carr'ying the gear 29, will. operate the interino-,-

dilate gear 3G and the gear l31, which 'is keyed upon the'rotatahle rod4, and therehy cause asimultaneous rotation of the selecting cylinder or drum 17. When the pointer alines with any one of the dial figures, the push rod 24 is pushed inwardly, so as to slide upon the central guide rod 5, upon which is slidahly mounted the main actuating racked or toothed bar 32, whose toothed portion is in mesh at all times with the gear 33, which is fast upon the sleeve carrying the' other toothed wheel' or -gear 11, and the large `gear wheel 24, whose periphery projects upwardly between the bar 32 and the tubeS. The gears and 24` are rotatably mounted upon the shaft 12 alongvside of the gearsl -39 and 42. Sli'dably mounted upon the remaining rod (i,v isthe call-up and ring-off' operating frame 35,'*at Whose. forward end are disposed the two lugs 36 and. 37, disposed at right angles to each other, the lug 36`being slidalolymounted upon the rods 5' and 6 and carried hy the inner end of the push rod 24, so that both the operating bar ,and the :trame 35 pushed in simultaneously, while 'the au ilisry push rod 38, mounted in the iframe is noel disposed to only engage the lug 37, to operate the frame 35 independently, the purpose of which will presently appear. side of the frame 35 is toothed and meshes at nlltimes 'with the small gear 39, which is fast to the large gear 42, both of which are rotatably mounted upon the shaft 12 alongsideof the gears 11 and 24', before mentioned. ln order to automatically return the frame 35 to initial position, the coiled spring 44, mounted upon the rod 6, is employed, the same exerting a pressure against the main frame and the frame 35 to move the frame 35 to the left as shown in Figs. 2 andl.

Journaled between the plates 13 and 14 and to the right of the shaft 12, as viewed in Fig. 4, is a shaft 45, having fastthereon, the two gears 46 and 47, which are at all times in mesh with the large gears 42 and 24. and by means of the ratchet wheels 46 and 4'?" and the governor arms 48 and 49,' respectively, movement of the carriage and the traine 35, under the tension of the respective springs, is regulated, thus provid` ing' a lockingl escapemcntfor each.

The selecting cylinder, when ready to he pushed in, has a space18 between two rows of teeth o disposed toaline with the lower end ot the pin 23, said' pin being of conn siderably less width. than the space, while the spring actuated pawl l?, which is ofy sub- The under.

stantially the Same width as the space is also disposed in line with a space between two rows ot teeth ce. Thus when the cylinder is pushed in, the cylinder will be properly guided by the pawl P and wherrat the end of the stroke and the pin 62 is engaged by the hook 70, the cylinder willY have a slight rot-ation imparted thereto, such slight Vrotation placing a row oi teeth a in line to engage the pawl P lout not sufliciently far to move the space out of alinement with the pin 23, thus the pawl l.) will lock the cylinder against a further pushing movement, while the arm 53 will lock the arm 49 due to the spring 57 so that the cylinder is locked against retraction.

As the manipulation of the carriage and selecting cylinder malte the selection and line connection, it is desirable that the frame 35 be held stationary during the spring actuation or movement ofthesame, and vice versa, that the carriage and selecting cylin# der be locked while the frame 35 is being automatically operated to' actuate the callupmechanism of the selectedsubscriber; and toaccomplish this', avery simple, yet el'ectivc device is employed. 'This consists primarily of the pin 50,-"mounted in the mai-n frame centrally of the. bottom thereof and. farther to the right as viewed 1n Figs. l

and 2, and having1 pivoted at its top the L shaped armature the' terminals 52, and

respectively of which are disposed to rest above the two governor arms 19 and 48 respectively with the terminal l in trout4 of the core 55 of thc electro magnet 56. It will thus be seen that when the electro magnet is energized` this being thel case when the push rod t is irst released after being pushed home, the terminal 52 will rest above the governor 49, to prevent the same from niovmg, thus lockingl the frame 35 but as the terminal is free or disengaged from the governor arm 18, the carriage and select;- ing cylinder arc free to move to the desired point of selection or stol'ipage. The de- `energizing otthe electro magnet, permitsl the spring 5T to act. pullingl the terminal 53 from engagement with the governor arm 4t), but tl'irowint;l the terminals 52 in engagement with the 4 vovernor arm 58, thus stopt iinfr the movement of the carrian'c and sei t', D

lccting cylinder andpermitting the trame 35 to be moved by its spring, to actuate the call-up mechanism in the selected set.

Disposed nearthe electro magnet 5G, is the' call-up circuit eoniprisiirq spring terminals 1G5--16(, the upper member ot which is disposed -in the path of and adapted to be ,actuated by 'the arm 5t), ot insulation earried by the trame 35, and provided with the reduced end (S0 and the notch ($1, intermediate of its ends, the same being provided to permit the call-up terminals to be separated and the line opened, when adjacent the end 60 and notch 61, and to be closed when in between. ,1

Mounted upon the exterior of the cylinder 17, beyond the circumferential groove thereof, are the studs or pins (32, one to each longitudinal groove of the cylinder, and formed upon the extreme inner end of the 'cylinder are the staggered shoulders (33, one to cach pin and groove, and each iu line with its respective pin and groove, The ribs (34 formed by the series ot' longitudinal grooves in the cylilulcr are provided each fywitha series c, of teeth, one to each sub- Scriberg and all of the teeth being cut in v`circu'mfcrential alinement, said teeth l`orming' a circuit making and breaking; device to operate the respective shunt intrv devices in the sustem, the cti-actingl spring; contact terminalsqt, being disposed to engage the teeth otene rib at a time, as shown in Fig. 2, and the specific purpose of which will be set forth in' the operation later on. Disposed in the path o'l' the staggered shoulders (53, of the selecting cylinder is another pair of co-a`cting spring terminals 6G, Whose purpose will appear later on. A conductor G7 1s connected to one terminal of the pair (36, andfis connected to the conductor 138, an other-'conductor 140 being connected to the other terminal 66 and leadingl to one terlminal ofthe other pair et terminalsI (38,

which'are'disposednpon the plate 14, and inthe path to be closed and opened by thc actuation of the carriage by the plate 9, the purpose of which will presently appear. Connected to the top of the frame o the key is a bracket 69. whose hooked lugs 70, pro ject downwardly and in thc path to enter between the pins 62, and insure upon the extreme inwardly movement of the selecting cylinder, the proper regiteringr ot the loner tudnal ,grooves with the locking;r and guide screw or pin 23, thus insuring the proper registering of the cylinder, in case the pointer did not exactly pointy to the proper dial number when thc operator pushed the rod 24.

In order that the various circuits may be traced in the diagram, as illustrated in `Fig.

.10 to demonstrate the. full operation of a system employing,r the present key, the eircuits will be traced in rotation or in their correct order, beginning with the calling of the operator at the exchange and the an swoi'ing oit such call by the operator, and to the final restoration of'the various subscribers instruments to the line.

With the various instrlu'nents in the po sition as illustrated in Fig. .1.0, the contacts t 35-ti5 are closed so that the signal S is connected to the line conductors IPL through the respective conductors 170, 171 and 172, so that all sulscrilnrs` sets are in line calling connection with the exchange E.`

Pre-supposing,l that a subscriberI desire-s to call the exchange, the receiver R is removed from the hoolt 1l?, and the magneto M at the callingsubseribefs set is actuated to actu'ate the exchange signal b" to indicate te4 the exchange operator that the call inar subscriber desires to be connected with a selected subscriber. Should the magneto M be dispensed with, the local battery B o't the calling subscriber-s set 'will be connectedto the line through the receiver hook 117 and contacts 120 and 121, thus bringing into the line the transmitter' l and thc receiver lt with the local batteries B', which will encrgize, in short lines, the signal S', and give such indication to the exchange. The eircuit closed when the receiver hoolt 117 is raised, is as follows: the Contact point. 121, the conductor 122, the coil 123, conductor 124, transmitter T, con( uctor 125, batteries B', condmztors huye-126, the contacts ltlTMlGS, the conductor 126, the. contact 120, and the receiver hook 11'?.` Assuming that the calling subscriber desires to converse with a subscriber, as for instance No. 5, exchange operator now inserts the jack plua .l in the calling subscribers socket 2, this action opening contacts 2-2. The push rod 2t of the selecting key K is now rotated until the indicator indicates No. 5, at which time the push rod is pushed upon and during,T such action the contacts 6G, due to the engagement thercot' with the enlarged portion of the cylinder 17, are closed and before the release of the key actuating rod 24, a circuit is closed at 66, and includes one contact 66, the conductors 67 and 138, the battery 139, the conductor 140, the electro magnet- 5G, the.conductor 140 and the other contact 66. Thus the electro magnet 56 is energized and attracts the armature 51 to place the arm 52 above and in engagement with the arm 118 to lock the automatic .ringer frame 35 against release. At the' same time that the cylinder 17 and frame 9 is moved inwardly, the normally open contacts 68 are engaged by the frame 9 and closed, but as contacts 2 2 ot the jack 2 are held open by the jack plug, the electro magnet 5G, as will later appear is not affected noW by the contacts 68.

As before stated, previous td the cylinder 17 having reached its full limit of movement, the hook engages a pin 62, and thus rotates the cylinder 17 to bring a single rowI of teeth a in line with the forward free end of the pawl P, andthe pawl vdue to its spring p engages the teeth a to stop the cylinder against further inwardmovement but permits the cylinder to move outwardly, due to the pressure ot the spring 3.. At the oppoV site side of the cylinder another row of teeth presently appear, open and cause the denergization of the magnet 5G, so lthat the arm 53 will be above to arrest the movement ot the arm 49. When the contact 65 is inthe depression between the respective teeth a, the closure is made between the contact 65 and. terminal 65, While when the contact (35' is riding upon one toot-h a, the contact isopeu at 65 and closed at 65', thus intermittently and alternately forming a talking connection and connecting the batteries 111 to the line. The release of the push rod 24, due to the spring 3 moves the cylinderl and frame 9 toward the initial position, and as t-he contacts G6 are closed by the enlarged portion of the cylinder 17, the circuit controlling the electro magnet 56 is energized. until the opening of said contacts 66 due to the snapping of said cont-acts from one ot the staggered portions 63 of the cylinder 17.

The opening of the circuit thus described,-

permits the spring 57 to hold the arm 53 above the arm .49, and thus lock the arm 49 to hold the cylinder 17 andvcarriage 7 locked against further movement toward initial position. As the cylinder 17`Was moved toward initial position and before being stopped by the arm 53, the teeth a engaging the contact '65, moves the same, to intermittently open and Iclose the contacts at 65 and. G5 and al ternately and intermittently open and close aceras@ the contacts 65e-65. rlhis action throws into the line the battery 111, so that the various shafts 73 in all of the subscriberssets are operated synchronously, to lock out all uncalled sets and place into line connection the single called set.

The circuit closed to .lock out the iincalled sets and connect the line in the called set, is as follows: the contacts 65--65, the conductor 110, the battery 111, the. conductor 112, the line conductors L-l the conductor j 12S, 111 each subscribers setpthe electro magnet 101` in each subscribers set, and the conductor 12S in each subscribers set', thus .i A

. i S0` The energization ot each electro magnet 101 operates the armature 101 in each set and thus ca'uses the-contactsI intermittently energizing the eleetromagnet 101 Vin all sets.

129-130 to intermittently cl'ose a circuit including the electro magnet 95 in each. set. rlhis circuit includes the contacts L29-130,

the conductor 131, the elect-ro magnet-95,

the. conductor 132, the batteries B', and the conductor 133. rllhus the intermittent energization of the electro magnet 95 in each set will operate the armature 94- to step the shaft 73 and the disk 102. The disk 102 in the uncalled set will be moved to indicate fred, it the line is busy. At this stage in each uncalled set, the receiver 'hook is locked and the uncalled sets shunted from the line, by reason of the lever being locked in down position b v the lock 77, engaging the notch 85. At the same time, the

contacts 134-135 are closed by the. lever S0 in such position as to shunt the uncalled sets from the lines L-L `through thrA l':onductor 1.36, contacts 13Ll 135 and conductor 137. are thus locked, it is impossible for the same to he released by lifting the receiverand the conductor 136, the contacts 134.--135 and the conductor-137 complete a shunt for As the uncalled sets receiver hooks the receiver circuit.v The receiver circuit is` c thus shunted from the line. Also as the pin 104 in the uncalled' set, is out of contact with the contacts 106,the bell 200 in each uncalled is held inoperative and will not be affected as the bell 200 is actuated in the called set. l

-When the cylinder 17'vvaslstopped in its movement, due to the contacts 66 being opened and slipping from engagement with the shoulder G3, the electro magnet l5G is denergized and the'spring 57 Will hold the armature 51 so that the arm 52 releases the the call-up the bar 5t) to rideover and press the contact 105 to engage the contact, tot) and thus throw into the liuc the call'up niachiuc` al ol the system. ily this means the call-up nnuhiuc. which may he operated at all tinics, or Iwhen desired, is thrown into the line through the wires :t: --3/ and energize the call-up alarni 200 in the calledV set. The period ot such ringing ol the call-up alarm 200 depends upon the length ot the bali titl and until its curved endtl passes ovcrithe contact lttt. Should the contact 165 be raised and separate troni the contact 160, the call-up niacnine .ll is cut from the line. Should the called aubscrilar not respond within a rca-- sonahlc time, the exchange operator will press upon the rorl 38 and consmuicutly the bar 5t) will he moved inwardly and as' the rod 3S is released, the spring il. as lxel'ore described, will rnove the traine to initial position and thus again cause the actuation ot' the call-up alarln 200 in the called sulscribers set.

The call-up alarm circuit energized by machine M when contacts 10o-166 are closed, is asV follows: the

' ground (j, the conductor c, the machine hl,

the conductor fz', the contacts 16B-166, the conductor f1, the conductor y', of jack plug J, the socket 2, the line L', the receiver hook 117 in the called set, the Contact 118, the conductor 115*7 the call-up alarm Q00, the

, conductor 1141, the contacts 106, which are closed by the pin 107 in the called Set, the conductor '113 and the ground g.

As the locking lever 77 in the called suhscribcfs" set is raised so as not `to be in the path to engage the notch ot' the arno S0, the receiver hook of the called subseribers set, when the receiver has been removed therefrom, will automatically rise and thus open the contacts at 117--118 and bridge the contacts 120 and 121 and thus throw into the lino the local battery circuit ol the called suhscribes set so that the called sulscrillcr and the calling suhscrilxu"s sels will he placed 'into connection with the line wires L and L. .lhe circuit thus closed is as l'ollows: the hool: 117, thc bridge a t contacts 1L20-121, the coiuluctor 122, the primary ot the coil 122i. the conductor 1241;, the tran lnittcr 'l`, thi` conductor 125, the battery li', the com'hu'ftors 12(3'-l2t the closed contacts 'HSS-107, the conductor 126, and contact 120. The receiver R is connected to thc line as t'ollou's: the receiver lt, the usual cord lt', the conductru 175, the facondary ot' the coil 12?, the conductor 122, the contact 121, the hook 117, the lines "ll-1', the conductor 128, the magnet 101` he conductor t28, andthe conductors 17o and 177.

At the end of the conversat-irm, the operator at the exchange removes the jack nlug J', and permits the' contacts 2-2 to close and as the contacts 68 are closed, due

to the 'frame 9 ol" the scleeting'key, engaging thein. the circuit including the eleetromag ncl 51' is closed, and thus the armature 5l. is moved in opposition to the spring 57 to rclnove the arni 58 'lroin engagement with thc-arm 11). ,lhis action will release the carriage T and move the cylinder t7 under the action ot' the spring 3, so that the cylinder isiuoved, as for instance from the position shown iu Fig. 2 to that shown in Fig. tl. During this movement, the teeth a are in engagement with the cont-.1ct (S5 and will intermittently open and close the contacts tta and (55 and thus throw into line the battery 11]., which as before described will actuat s all of the'clectrolnagnets 101 in every subscribers set to automatically operate the shafts T3, the electroniagnets 95, the armatures 94, so thaty the disks 102 will he placed in normal position to indicate that. the liuc is 'tree and that the exchange can be called by all subscribers. At this linie all of the hooks 117 can be raised, as the locking lever 77 is in raised position and out of the path to engage the notch 85 ot the various arms S0.

Vln the event that a receiver in any Set is left ott' of the hook 117, such hook is gg'mscquently raised, to permit contacts `134-135 to be opened, with contacts 167---168 closed, and the arm S0 due to the armature catch 83 will have carried with it the armSl. Now yas the shafts 73 are rotated, as before described, during the selection of a called subscriber' aiid the locking out of the` unealled subscriber, the in 108 carried by the disk 10Q-will engage t e Cong tacts in each set, thus closing a circuit in. each set to energize thc electromagnet 88. Thus in the set Where the hook 117 is raised, tht` armature catch 8B willbe moved outwardly toward the magnet 88, Fig. 10, and Ishould this -hc an uncalled set, this set will be shunted from the line by the fall oi the ar1n 8l which closes the contacts 131-135 ot? the shunts 13G-137. This circuitis as t'ollows: the contacts 105, conductor 151, elcctronnignet 8S, conductor 150, battery tcl-.0, and conductor 1118, thus energizing the electrmnagnet Sti to attract the armature catch S3, as ahove described, to release the arni S1, which duc to gravity will 'lall and close the contacts 15M-135, thus shunting the set Ytfromtllc lilies Ilm-L.

As before stated, the contacts 167-167 are hcld open by the arm 81 when down, and by this ari-:nigcluent it isevident that the local l'mttcry B is saved, should the re ceivcr It, he purposely or accidentally left ot'l' thc hook 117,

that is claimed, iszl. A selecting hey having a supporting trame, a carriage sliflahly mounted therein,

a rotatable selecting rnclnher mounted inthe carriage, Ineaus tru-,rotating said mentber, and for imparting to tlie Carriage an spring, nieans for retaining the carriage And member in selected posit-ione and means for releasing said retaining means to permit the carriage to return 'to initial position.

3. A selectingltey, having; a supporting frame, a carriage slidably mounted therein,

a spring tor causing,` return of the carriage, rotatable selecting member mounted in the carriage., means for rotating said member and for moving tlie oariiagefand member against tl e tension oi' tbe spring into selected position, and eleotroiiiagiietically operated means disposed to act as lock to retain tlie 'carriage at selected position and as :i release to permit the carriage to return to initial position.

i. seleetingkey, having a supporting iframe, a carriage'slidably mounted therein, a selecting;r member rotatably mounted in the carriage.J a. rod foi-rotating said member and for imparting tothe carriage an inward movement, means for retaining said carriage and member in selected position, and means for releasing said retaining means to permit the carriage to return to` initial position.

5. A selecting key, having a supporting frame, a carriage slidably mounted therein, aspring for causing tlie return of the oarriage to initial position, a selecting member rotatably mounted in the carriage, a rod for l rotating said member and tor. imparting` tov tbe carriage an inward movement against the tension of the spring, Ameans for retainingsaid carriage and member in selected po` sition, and means for releasing said retaiiiing means to permit the spring to return the carriage and member to initial position.

6. A selecting key, having a supporting frame, a carriage slidably mounted' therein, a spring for causing tlie return of the earriage, a rotatable selecting member mounted in tbe carriage, a rod for rotating' said` 'member and for iiiipzirtiiig to tlie carriage an inward movementagainst the tension of the spring to selected position, and electromagnetically operated meansdisposed to retain the carriage at selected position and permit the same to be released und the carriage return to initial position. f l

'Z'. A selecting key, having a supporting frame, a Acarriage slidably mount-ed therein,

a rotatable selectingmember mounted thereL Los Lees in, Ameans for rotating said lmember and iin parting to the carriage an inward sliding movement to selected position., means for operating a call-up circuit and to retain the carriage and member in selected position,

auxiliary means for operating the call-up circuit during the stationary position of the Carriage in selected position, and means for releasing tlie retaining means to permit tlie carriage to return to initial position."

8. A selecting key, having a. supporting frame, a carriage slidablymounted tlierein, a rotatable'selectiiiginember mounted therein, a rod for imparting a rotary movement to tlie selecting member and for sliding` the carriage to selected position, means -for retaining tbe Carriage in selected position, callup operating means controlled during the recession oi' t ie carriage towardseleeted pon sition, auxiliary means "for the call-up operating means to operate tlie saine while tlie carriage is in selected position, and means or releasingr tlie retaining; means to permit the earriage to .return to linitial position 9. A selecting; key,fbaving a-snpportinfg frame, a .carriage slidably ino'untedtlierein,

a springfor causing the return of tbe earriage, `:i rotatable selecting' member mounted therein, means fortrotating said member and imparting to the carriage a movement 9 against tlie tension of tlie spring te selected` position, means for retaining the carriage in selected position, call-up operating means controlled during;` tbe recession of the car-j n riage toward selectedposition, auxiliary call-up operating means to operate the same While tbe carriage is in selected position, and means for releasingl the retaining means to permit the spring to'return the carriage to initial. position.

.roo

l). .A selectingT key, having asiipporting traine a carriage slidabl mounted therein a spring for causing.,r tlie return of tlieI carriage, a rotatable selecting; member mounted therein, a rod iiorrotating said member and for imparting to tlie carriage' and member' a movement 'the tension of the spring; to selected position, means for retaining the carriage in selected position,

call-up operating' ineensl controlled during the recession of the carriage and member toward selected position, auxiliary call-up operating' means to operate-the sameduring' the 'stoppage of tbeearriage and inemberin seleetedposition, and means for releasing;

"the retaining means to permit the spring'to return tbe carriage to initial position.

il. A selecting key, liavii'igra frame, a carringe mounted toi' longitudinal reciprocating movementv therein, a 4selectiinr member mounted in and carriedby the carriage-"a spring),- for exerting a tension to retuinfitbe carriage to initial position, means ior nieving tlie carriage and j member to selected position, ineens for -`retainng "dieser ia int,ir mechanism.

and member in selected position, a slidably mounted springr actuated call-up operating mechanism disposed to he simultaneously set with the movement ot' the airiae'e and member to selected position. means t'or controlling the automatic return by tlic springr` position, means for retaining' the carriage and member in selected position. a slidably mounted spring actuated call-up operatingr mechanism disposed to be simultaneously set with the movement ot the carriage and member to selected position. means for controllingi the automatic return of the call-up operating mechanism by its spring, and an electro-magnetically and spring actuated locking means disposed to lock the carriage during' the operating of the call-up operating;r mechanism and the call-up operating mechanism during' the movement of the carriag'e under its spring'.

413. A selecting key, having' a frame, a carriage mounted for sliding movement; therein, a spring for returning the carriage, a selectingmember carried by the carriage. means :tor ope ating the carriage and said member, a spring actuated call-up opernt` inte,r means Set simultaneously with the car` riage and member, and means vtor locking the call-up operating mechanism durinnr the recession of the carriage and the carriage dui-ine; the recession ot the call-up operat- 14.. .A selecting' key, having a trame, a carriage' mounted t'or reciprocation' therein, a spring for returning said carriage to initial position,-a selecting member carried bythe carriage, means t'or operating the carriage against the tension of the springiand ior operating thc selecting member to cause the' carriage to stop at selected position, means tor locking,r the carriage in selected position. a line circuit completingr means actuated by the carriage, a slidably mounted spring returned call-up mechanism operating,r in parallel with the carriage, a lock tliere't'or, and an elcctro-magnetically and spring actuated means tor locking,r either the carriage lot-k or the call-up oiurat'iiml nicchanism during,r the operation ot' the other.

l5. A selecting key, having a fratrie, a carriage mounted :tor rcciprocation therein,

a springr for returning the carriage to initial position, a Iselecting member carried in the carriage, maninilly operated means for opcratinpr the member and for moving the carriae'i against the spring, a spring actuated call-up operating means disposed parallel to the ai-ringe and operably connected with the carriage operating means, a governor lock and release t'or thc carriage and call-up operating means, and an electro-magnetirally and spring controlled means for engaging either governor at a time to permit one to operate and lock the other.

lt'. t selecting` key, having a supporting traine, a carriage mounted for reciprocation therein, a. spring t'or holding the carriage in and tovvard initial position. a rotatably mounted selectingr cylinder mounted in the carriage, a rotatable andslidable push rod operably connected to the cylinder to rotate the cylinder and to be pushed upon to move the carriage and cylinder alfainst the tension of the spring to selected position, a Sprlng returned call-up ope ating mechanism disposed .tor parallel movement to the carriage and adapted to be moved simultaneously with the carriage and through the medium ot' the rod, and an clectro-magnetically and spring controlled locking mechanism tohold the carriage and cylinder in selected position While permitting the call-up mechanism to operate and vice versa.

17. In a selecting; key, the combination with a reciprocatory selecting means, and a simultaneously set call-up operating mechanism, of an electro-magnetically and spring actuated means for permitting thc automatic operation of either the selecting means or the call-up opcratiinglr mechanism, whereby the call-up operating mechanism can not opcrate during line connectiop and vice versa.

torkod terminals disposed to lock either the carriage against movement .or the call-np operating' mechanism against movement, and means tor operating said arm to release the one and lock the other.

19. ln a selecting key, the combination with cooperatively disposed reciprocatory and spring returned selecting mechanism and call-up operating mechanism. and means for moving both into selected position against the tension of the springs, of a lock for lockingr one and releasing the other, and vice versa.

Q0. ln a selecting Key, the combination with cooperatively disposed rcciprocatory and spring: returned selecting and call-up operating mechanism. and manually operated means for moving!` both against the tension ot' the springs and to selected posiv one set being at the socket and normally closed when the sockety is iti-ee; a selecting key for controlling the other two sets yofy contacts; and a spring and electro-magnetically actuated armature lock for the selecting key controlled by the electromagnet for locking the key in selected position .when the plug is in tlie'soeket, the other two sets of contacts being closed by the key and the magnet encrgized,.wliei'eby the removal of Vthe plug from the socket opens the local circuit. and clenergizes the magnet to release the armature lock and permit the key to return to initial position.

22. The combination in a telephone system, of an exchange station having a callmeneer ing plug and socket; a local circuit including a'source of electrical energy, an electroniagnet, and three sets of' spring contacts, one set being at tllc socket and normally closed when the socket is free; a manually operable and spring returned selecting key for controlling the other two sets of contacts; and a spring and elcctro-magnetically actuated armature lock for the selecting key controlled by the electromagnet for locking the key in selecting position when the plugj is in the socket, the other two sets ol contacts being closed by the key and the magnet energized, -Wliereby the removal of the plug from the socket opens the local circuit and (lencrgizes the magnet to release the armature lock and free the key to the action of its spring.

In testimony that I claim the foregoing as my own, l have hereto affixed my signature in the presence of two witnesses.

'RUBEN c. M. HAsTiNes.

Witnesses L. A. KooNs, E. C. lVoonwon'iH.

Qfr 

